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Clear air turbulence over South Africa

Published online by Cambridge University Press:  18 April 2001

M P de Villiers  and
J van Heerden
M P de Villiers
Affiliation:
South African Weather Bureau, Private Bag X97, Pretoria, South Africa
J van Heerden
Affiliation:
University of Pretoria, Department of Civil Engineering, Pretoria, South Africa
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Abstract

Clear air turbulence (CAT) at high altitude remains a hazard to aviation which can result in passenger injury and aircraft damage. Two limited surveys of CAT events over South Africa, 1993-1995 (inclusive) and 1998, are used to illustrate the most likely synoptic conditions under which CAT can be expected. A case study of CAT associated with an upper-air trough and a mountain wave is presented. The study also evaluates the effectiveness of the Ellrod Turbulence Index (ETI) derived from model data provided by the UK Met. Office. A forecast of ETI derived from the Global Spectral Model of the United States National Center for Environmental Prediction (NCEP) is also reviewed.

Type
Research Article
Information
Meteorological Applications , Volume 8 , Issue 1 , March 2001 , pp. 119 - 126
Copyright
© 2001 Royal Meterological Society

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